Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- DNA molecules are repeated during which step of the cell cycle? Explain how chromosomes' kinetochores function. The California two-spot octopus (Octopus bimaculoides) has 28 chromosomes in a diploid cell. Mitosis occurs in the cell. In each daughter cell, how many chromosomes do you have?arrow_forwardIs it true that the cell cycle is regulated very tightly?arrow_forwardIf plant cells had the following % of their cells in these stages of mitotic cell division and % of cells reflects how much time they spend in each stage: Interphase=74.9% Prophase=17.3% Metaphase=3.3% Anaphase=D1.8% Telophase=D2.7% and Animals had the following %s: Interphase3D62.5% Prophase-D31.5% Metaphase=3.3% Anaphase=D2.0% Telophase%3D0.7%. Which of the following can we NOT conclude? O A. Both plants and animal cells spend most of their time in interphase, doubling all of the organelles and DNA requires a lot of time. OB.Animal cells spend more of their time in mitosis (dividing the nucleus) than plant cells do. O C. Plant cells spend more time in interphase and telophase than animal cells and animal cells spend more time in prophase, and anaphase than plant cells. OD. Plant cells divide more quickly than animal cells.arrow_forward
- The Rb protein has been called the “master brake” of the cell cycle. Describe how the Rb protein acts as a cell cycle brake. How is the brake released in mid- to late G1 to allow the cell to proceed to S phase?arrow_forwardWhich phases of the cell cycle is generally the longest in the cells of a mature eukaryote? What steps make it longest phase?arrow_forwardWhat are the conditions that might cause a cell to halt the cell cyclearrow_forward
- Suppose you have a way of measuring the amount of DNA in a single cell during the cell cycle. You first measure the amount at the G1 phase. At what points during the rest of the cell cycle would you predict changes in the amount of DNA per cell?arrow_forwardA researcher, who is examining a sample of cells of the same types at different stages of cell division, isolates a group of cells in the sample that have 1.5 times the amount of DNA as cells at the G1 phase. Which of the following best describes this group of isolated cells? A B с D They are in the M phase of the cell cycle. They are between the G1 and the S phases in the cell cycle. They are in the S phase of the cell cycle. They are in the G2 phase of the cell cycle.arrow_forwardIn the experiment below, you have treated cells with different cancer drugs, stained them with propidium iodide, and analyzed them by flow cytometry. Which of the following histograms illustrates what you would expect to see in the event that the spindle assembly checkpoint is activated (focus on the solid line, the dotted line is normal cell cycle control)? 1. D 2. C 3. A 4.Barrow_forward
- One approach to studying the regulation of cell cycle progression (particularly in an era when genetic and molecular biology manipulations were less readily accomplished in mammalian cells) was to use treatments that induced cells to fuse and then monitor the behavior of the two nuclei in the resulting cell. The figure below depicts data from one such study. The investigators did preliminary work to produce populations of cells that were synchronized in various stages of the cell cycle (G1, S, or G2 in the examples shown below). They then fused the cells in different combinations and monitored subsequent events in each of the nuclei. For purposes of this question, we will pay particular attention to what occurred in the nucleus that came from the cell in G1. In one experiment (I), cells in the G1 and S phases were fused. That event caused the nucleus from the G1 cell to very quickly enter the S phase (sooner than it would otherwise have done so). In contrast, in a second experiment…arrow_forwardWhat are the three types of microtubules involved in the formation of the mitotic spindle? Briefly describe the contribution of each to successful cell division.arrow_forwardCan you draw 4th cell division of the adult stem cells. 1st and 2nd are symmetrically. 3rd and 4th are asymmetrically. What kind of cell is the product at the 4th division? Explain your reasoningarrow_forward
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